Red Island sea temperatures peak in the range 18 to 20°C (64 to 68°F) on around the 9th of February and are at their minimum on about the 23rd of August, in the range 12 to 14°C (54 to 57°F). The warmest Red Island sea temperatures in early to mid February require something like a 3/2mm fully sealed wetsuit. The minimum sea temperatures at Red Island in the fourth week of August are ideally suited to a 4/3mm wetsuit + 3mm boots, although a 5/3mm wetsuit may be preferable for longer sessions and cold windy days.